CN105981290B - Control circuit and control method for synchronous motor - Google Patents
Control circuit and control method for synchronous motor Download PDFInfo
- Publication number
- CN105981290B CN105981290B CN201580008528.6A CN201580008528A CN105981290B CN 105981290 B CN105981290 B CN 105981290B CN 201580008528 A CN201580008528 A CN 201580008528A CN 105981290 B CN105981290 B CN 105981290B
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- China
- Prior art keywords
- synchronous motor
- capacitor
- control circuit
- emk
- switch
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The control circuit for the synchronous motor (1) that the present invention relates to a kind of for hand-held dental implement, the control circuit has voltage supply device (2) and the clamp circuit (7) by switch (6) connection, a kind of and method of the rotation position for the rotor for measuring synchronous motor (1), wherein supplied in a total duration (T2) internal cutting off electric current, clamp circuit (7) are coupled in a time interval (T1), then measure EMK and the rotation position is measured according to the EMK.
Description
Technical field
The present invention relates to a kind of control circuit of synchronous motor for hand-held dental implement, the control circuit has
Voltage supply device and a kind of rotation position for the rotor for measuring synchronous motor are to carry out revolving speed control to the synchronous motor
Method.
The prior art
Synchronous motor, i.e., the synchronous motor run with electric motor mode, is known for example for hand-held dental device
The power driver of tool, wherein rotor is moved synchronously with movement rotating field in the stator.
It is further known that needing to obtain rotor during operation relative to rotatable stator to control such synchronous motor
The position of field.By 195 27 982 A1 of DE for example it is known that sensor is arranged thus.
Its shortcoming is that such sensor can generate fringe cost, and in view of hygienic requirements, sensor is for example collected
At in hand-held dental implement, problem might have.
The method of another kind measurement rotor-position is induced electromotive force (EMK) caused by measurement rotor.But it must cut thus
The power supply of motivation winding is powered off, this operation needs certain time, do not provide driving power therebetween.To shorten this period,
The way known is, for example, demagnetization, but this will lead to the generation of braking moment.
Even as a result, constantly being converted between torque braking moment in driving torque and lacking.This lasting turns
Square variation is likely to result in unexpected vibration and noise.
The method and apparatus that 0 993 108 A2 of EP describes a kind of rotation position that rotor is obtained by EMK measurement.It should
Method based on the principle that measurement rotor in the stator windings caused by induced electromotive force (EMK), wherein by other stators around
Group short circuit, and electricity shortage is generated when close to zero passage is assumed.
Its shortcoming is that measurement is influenced by the zero passage of stator current.But it if is not surveyed when close to current over-zero
Amount, will cause being significantly increased for waiting time in terms of demagnetization, specifically depending on the current instantaneous value in winding.
The object of the present invention is to provide a kind of circuit and a kind of method, the method can be when synchronous motor be run at any time
EMK is measured, by the demagnetization of motor winding and generally keeps shorter time of measuring as early as possible.
Summary of the invention
The present invention is a kind of synchronous motor for hand-held dental implement to the solution for reaching above-mentioned purpose
Control circuit, the clamp circuit that the control circuit has voltage supply device and connected by switch.
The clamp circuit facilitates after interrupt voltage is supplied soon by control circuit demagnetization, thus in very short time
The interior state formed almost without electricity and the measurement for realizing induced electromotive force (EMK).
The power supply of synchronous motor need not be thus interrupted for a long time, to especially can avoid vibration and noise.So
One, such a synchronous motor is especially suitable for hand-held dental implement, such as pulpal treatment.
In addition, control circuit of the invention helps to provide a kind of brushless or the motor without control sensor.
The voltage supply device for example can be full-bridge.The switch can be high power electronic switch, such as power
Analog switch (Leistungsanalogschalter).To keep measurement interruption as short as possible, the switch should be very
Fastly.
Valuably, the clamp circuit is clamped on the neutral point or simulation neutral point of the control circuit.
By clamping on the neutral point of control circuit, it is able to achieve quick demagnetization, and then realize extremely short measurement interruption.
For this purpose, can directly pass through the additive wire extraction neutral point for implementing clamping operation.The additive wire and with
Associated contact point can be removed, be achieved in that in control circuit simulate neutral point and clamp in this simulation
On property point.Wherein it is possible to by being formed by voltage in motor phase come the position of prespecified neutral point.It whereby can be by synchronization
The asymmetry of motor is taken into account, and EMK also can also be precisely enough measured in the case where voltage is extremely low.
Valuably, the control circuit has capacitor, neutral point described in the capacitor simulation.
Exactly in dental applications field, such as in hand-held dental implement, steric requirements is extremely limited, therefore passes through mould
Quasi- neutral point saves additional neutral point inlet wire, this is beneficial.It is a kind of for simulating the capacitor of the average voltage of neutral point
Element that is particularly simple, being used to simulate neutral point.
Valuably, the control circuit has start unit, and the start unit can be connected to the capacitor by switch
Device.
Capacitor can be set as initial value before synchronous motor startup by the start unit that can be connected.It thus can be preparatory
Capacitor is charged into desired value, to substantially shorten the startup stage of synchronous motor.
In addition, the present invention relates to a kind of rotation positions of rotor for measuring synchronous motor to turn to the synchronous motor
The method of speed control.Party's law regulation, the synchronous motor described in a total duration internal cutting off during synchronous motor operation
Electric current supply, and clamp circuit is coupled to the neutral point of the synchronous motor in a time interval.Between the time
Every measurement induced electromotive force (EMK) later and the rotation position is measured according to the induced electromotive force.
Connecting clamp circuit in short-term can make synchronous motor reach the state at least almost without electricity as early as possible, so as to extremely short
The measurement of EMK is realized in time.The vibration that synchronous motor is interrupted power supply for a long time and generated therefrom is avoided whereby
And/or noise.Therefore, the method is especially suitable for hand-held dental implement, such as pulpal treatment.
Valuably, EMK described in high resistance measurement.Influence by the voltage drop in series resistance to the winding of synchronous motor whereby
Minimize and this influence can be ignored.For this purpose, the size of resistance required for measuring should be the ohmic component of winding
At least 10000 times of (ohmscher Anteil).If, can also basis when corresponding constant is known without high resistance measurement
Measured value calculates such voltage drop.
Valuably, it by neutral point described in capacitor simulation, and supplies in turn-on current to run the synchronous motor
Before, the capacitor is charged into desired value.
Capacitor is a kind of scheme of simple simulation neutral point, and can save additional measurement inlet wire.But
After start-up, certain time is needed in startup stage to make capacitor reach steady state value and simulate neutral point.Capacitor is pre-
Desired value is charged to, this can be shortened the starting time.
Valuably, the rotor every revolution, EMK described in repeated measurement.
Repeated measurement helps avoid error.Successively repeated measurement and the change between measured value can measured after clamp thus
Change.When the variation between measured value reaches minimum, it is not necessary to be further continued for measuring.It can terminate measurement whereby to be interrupted and couple once again same
Walk the voltage supply of motor.This can further shorten to measurement interruption set by measurement EMK.
Brief description of the drawings
Control circuit of the invention and method of the invention are illustrated referring to attached drawing.Wherein:
Fig. 1 is the synchronous motor with control circuit；
Fig. 2 is the method schematic diagram for measuring the rotation position of rotor；
Fig. 3 is another modification of the control circuit.
Embodiment
Fig. 1 shows synchronous motor 1, connects into determining for star 3 with the voltage supply device 2 and three for being configured to full-bridge
Sub- winding 4.Full-bridge 2 respectively connects a stator winding 4 by a feeder line 5.By clamping and switch 6 respectively couples a pincers on feeder line 5
Position circuit 7.
Fig. 2 is to illustrate the switch and contact condition S that illustrate the method about the rotation position for measuring rotor, wherein being closed
Switch state contact condition is indicated with z in other words, the switch state of disconnection is indicated not in contact with a in other words.Interrupt 2 institute of full-bridge
The power supply of offer.For this purpose, the full-bridge can for example have switch 9, the switch state of the switch is indicated with solid line.?
This stage, synchronous motor 1 are run as generator to a certain extent.But voltage caused by this generator is felt
Voltage caused by electric current is answered to cover.To establish light condition as early as possible, clamp circuit 7 is coupled by switch 6, will pass through clamp
The ohmic load of circuit 7 carrys out demagnetization.For this purpose, clamp circuit 7 can for example have resistance 8 shown in Fig. 1.
Clamp circuit 7 is coupled at least in shorter time interval T1.In Fig. 2, the switch of clamp circuit 7 or switch 6
Position in dashed lines is indicated.After the demagnetization realized therefrom, disconnected in other words in time interval T1 past and then degree
Switch 6 and clamp circuit 7 is decoupled once again.Now, synchronous motor 1 is almost without electricity operation, and opposite 3 high resistant of neutral point
Measure EMK.To minimize error, in other words, to reach the state as far as possible without electricity, the resistance 13 of high value is selected, and
The resistance 8 of high value is also selected as far as possible.In Fig. 2, contact is indicated with dotted line.Then coupling full-bridge 2 is to synchronize once again
Power supply provided by motor 1.
Therefore, the total duration T2 of interrupt voltage supply time interval T3 group as required for time interval T1 and measurement EMK
At.Total duration is especially short, because can be soon by synchronous motor demagnetization by clamp circuit 7, thus it is able to maintain the extremely short time
It is spaced T2.
For shorten as far as possible measurement EMK required for time T3, such as can after clamp, i.e., time interval T1 it
Afterwards, with speed as fast as possible successively repeated measurement EMK, and measured value is compared with previous measured value respectively.When
Measured value no longer changes, or when the variable quantity limiting value for example prespecified less than one, end time interval T3, that is,
Stop measuring and coupling the power supply of synchronous motor 1 once again.
It is shown in Fig. 1 go out first implement in modification, the measurement of EMK on neutral point 3 not by directly measuring
And realize, because this needs additional conducting wire, and for example in dental motor, often for space and/or cost reason
And save corresponding inlet wire.Specifically, this embodiment is to simulate neutral point 3 by resistance 13 and capacitor 10.For this purpose,
Capacitor 10 is coupled to feeder line 5 by resistance 13.Passive simulation neutral point 3 whereby.
The capacitor is by 13 connecting stator winding 4 of high resistance measurement, so that can be measured that on the capacitor flat
Equal neutral point voltage.
Since resistance 13 must be high value, operation otherwise can be interfered, therefore after the starting of synchronous motor 1, needs phase
To form average neutral point voltage on capacitor 10 and interference-free operation is realized when the long time.To reach capacitor as early as possible
The stationary value of device 10, in the embodiment in figure 1, have can preset entry condition start unit 11 further pass through switch 12
It is connected to capacitor 10.Start unit 11 for example can be the voltage source with preset voltage value.Before synchronous motor startup and/
Or when starting, switch 12 can be closed and merge into capacitor 10 and be pre-charged, so that its be made to correspond to desired neutral point.Then, it switchs
13 disconnect once again and also remain open in the remaining runing time of synchronous motor 1.
Therefore, initial value can be at least set when initial by the passive simulation of neutral point by the starting unit.It is logical
It crosses and is pre-charged for capacitor, the unstable starting time can be shortened to avoid difficulty in starting or at least.
As shown in figure 3, can also directly detect EMK on neutral point 3 by inlet wire 14, capacitor 10 is thus eliminated
With start unit 11.
Appended drawing reference
1 synchronous motor
2 voltage supply devices
3 neutral points
4 stator winding
5 feeder lines
6 switches
7 clamp circuits
8 resistance
9 switches
10 capacitors
11 start units
12 switches
13 high resistance measurements
14 neutral point inlet wires
The switch state that a is disconnected/not in contact with
S switch/contact condition
T1 time interval
T2 total duration
T3 time interval
Switch state/contact condition of z closure
Claims (7)
1. a kind of synchronous motor (1) for hand-held dental implement is electric with the control for carrying out revolving speed control to the synchronous motor
Road, the control circuit have voltage supply device (2), which is characterized in that
The stator winding (4) that every phase output of the voltage supply device (2) connects into star (3) with three respectively is connected,
The control circuit has clamp circuit by switch (6) connection and including resistance (8) and capacitor (10)
(7), wherein the capacitor (10) is connected to the stator winding (4) by a resistance (8) and a switch (6) respectively
In one on, so as to the switch (6) closure after by the synchronous motor (1) demagnetization, and
The capacitor (10) simulates neutral point (3).
2. control circuit as described in claim 1, which is characterized in that the clamp circuit (7) is clamped at the control electricity
On the simulation neutral point on road.
3. control circuit as described in claim 1, which is characterized in that the control circuit has starting unit (11), described
Starting unit can be connected to the capacitor (10) by switch (12).
4. a kind of rotation position for the rotor for measuring synchronous motor (1) is by control as claimed any one in claims 1 to 3
The method that circuit processed carries out revolving speed control to the synchronous motor (1), which is characterized in that
The electric current supply of the synchronous motor (1) described in a total duration (T2) internal cutting off during synchronous motor operation,
Clamp circuit (7) is coupled to the neutral point (3) of the synchronous motor (1) in a time interval (T1),
Induced electromotive force (EMK) is measured after the time interval (T1), and
The rotation position is measured according to the EMK.
5. method as claimed in claim 4, which is characterized in that EMK described in high resistance measurement.
6. method as claimed in claim 4, which is characterized in that by capacitor (10) simulation neutral point (3), and
Before turn-on current supply is to run the synchronous motor (1), the capacitor (10) is charged into desired value.
7. the method as described in any one of claim 4 to 6, which is characterized in that the rotor every revolution, repeated measurement institute
State EMK.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014202771.3A DE102014202771A1 (en) | 2014-02-14 | 2014-02-14 | Control circuit and control method for synchronous machine |
| DE102014202771.3 | 2014-02-14 | ||
| PCT/EP2015/053207 WO2015121467A1 (en) | 2014-02-14 | 2015-02-16 | Control circuit and control method for a synchronous machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105981290A CN105981290A (en) | 2016-09-28 |
| CN105981290B true CN105981290B (en) | 2019-08-16 |
Family
ID=52633229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580008528.6A Active CN105981290B (en) | 2014-02-14 | 2015-02-16 | Control circuit and control method for synchronous motor |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US10312840B2 (en) |
| EP (1) | EP3105848B1 (en) |
| JP (1) | JP6726101B2 (en) |
| CN (1) | CN105981290B (en) |
| DE (1) | DE102014202771A1 (en) |
| DK (1) | DK3105848T3 (en) |
| ES (1) | ES2750316T3 (en) |
| WO (1) | WO2015121467A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016117258A1 (en) | 2016-09-14 | 2018-03-15 | Universität des Saarlandes | Method and device for determining a rotor position of a rotor of an electronically commutated electric machine |
| DE102017204331A1 (en) * | 2017-03-15 | 2018-09-20 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg | Brushless electric motor |
| KR102337082B1 (en) | 2017-08-28 | 2021-12-08 | 가부시키가이샤 모리타 세이사쿠쇼 | Dental treatment device, and method of driving the same |
| SE544612C2 (en) * | 2019-05-07 | 2022-09-20 | Bombardier Transp Gmbh | A method of determining the position of a freely rotating rotor in a permanent magnet motor, and a control ciruit and a system therefore |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1215944A (en) * | 1997-09-26 | 1999-05-05 | 三洋电机株式会社 | DC brushless motor drive device |
| CN102739139A (en) * | 2011-04-01 | 2012-10-17 | 思科普有限责任公司 | Rear electromagnetic force detection circuit |
| EP2570291A1 (en) * | 2011-09-16 | 2013-03-20 | Siemens Aktiengesellschaft | Drive system of a battery-operated vehicle with a frequency converter fed permanently excited synchronous machine |
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| US4054818A (en) * | 1975-10-20 | 1977-10-18 | Risberg Robert L | Solid state current source polyphase inverter induction motor drive |
| JPS59159690A (en) * | 1983-02-25 | 1984-09-10 | Aichi Electric Mfg Co Ltd | Rotor position detecting system of brushless dc motor |
| US4697230A (en) * | 1986-06-23 | 1987-09-29 | Westinghouse Electric Corp. | AC power supplied static switching apparatus having energy recovery capability |
| US5005115A (en) * | 1989-07-28 | 1991-04-02 | Westinghouse Electric Corp. | Forced-commutated current-source converter and AC motor drive using the same |
| DE19527982C2 (en) | 1995-07-31 | 2002-08-22 | Fhp Motors Gmbh | Electronically commutated electric motor |
| US6169672B1 (en) * | 1996-07-03 | 2001-01-02 | Hitachi, Ltd. | Power converter with clamping circuit |
| DE19846831B4 (en) | 1998-10-10 | 2008-05-29 | Diehl Ako Stiftung & Co. Kg | Method and device for determining the rotor position of synchronous motors |
| US6236179B1 (en) * | 2000-02-21 | 2001-05-22 | Lockheed Martin Energy Research Corporation | Constant power speed range extension of surface mounted PM motors |
| DE10031423B4 (en) * | 2000-04-12 | 2008-05-15 | Strothmann, Rolf, Dr.rer.nat. | Device for determining the rotational position of the rotor of an electrical machine |
| FI112006B (en) * | 2001-11-14 | 2003-10-15 | Kone Corp | with electric motor |
| ATE377286T1 (en) * | 2003-07-15 | 2007-11-15 | Gamesa Innovation & Tech Sl | CONTROL AND PROTECTION DEVICE FOR A DOUBLE FEEDED INDUCTION GENERATOR SYSTEM |
| US7839107B2 (en) * | 2006-10-31 | 2010-11-23 | Kaltenbach & Voigt Gmbh | Method and circuitry arrangement for operating a brushless electric motor |
| US7489097B2 (en) * | 2006-11-02 | 2009-02-10 | Chrysler Llc | Sensorless position detection for a brushless direct current motor during inverter standby |
| US7994747B2 (en) * | 2007-07-13 | 2011-08-09 | Seagate Technology Llc | Suppressing phased motor voltage transients on disconnect |
| FI121493B (en) * | 2007-07-26 | 2010-11-30 | Kone Corp | with electric motor |
| US7940503B2 (en) * | 2008-05-27 | 2011-05-10 | Infineon Technologies Ag | Power semiconductor arrangement including conditional active clamping |
| JP2010288425A (en) * | 2009-06-15 | 2010-12-24 | Texas Instr Japan Ltd | Motor control device and disk drive device |
| DE102009048944A1 (en) * | 2009-10-10 | 2011-04-14 | Sick Ag | Method and device for fail-safe monitoring of an electric motor drive |
| CA2833384C (en) * | 2011-04-18 | 2019-08-20 | Innovolt, Inc. | Voltage sag corrector using a variable duty cycle boost converter |
| US8558495B2 (en) | 2011-08-01 | 2013-10-15 | Atmel Corporation | Sensorless BLDC motor control by comparing instantaneous and average BEMF voltages |
| US9755423B2 (en) * | 2014-03-13 | 2017-09-05 | Infineon Technologies Ag | Overvoltage protection for a synchronous power rectifier |
| GB201416011D0 (en) * | 2014-09-10 | 2014-10-22 | Trw Ltd | Motor drive circuitry |
-
2014
- 2014-02-14 DE DE102014202771.3A patent/DE102014202771A1/en not_active Withdrawn
-
2015
- 2015-02-16 CN CN201580008528.6A patent/CN105981290B/en active Active
- 2015-02-16 JP JP2016550606A patent/JP6726101B2/en active Active
- 2015-02-16 WO PCT/EP2015/053207 patent/WO2015121467A1/en active Application Filing
- 2015-02-16 ES ES15708749T patent/ES2750316T3/en active Active
- 2015-02-16 EP EP15708749.5A patent/EP3105848B1/en active Active
- 2015-02-16 DK DK15708749.5T patent/DK3105848T3/en active
- 2015-02-16 US US15/118,634 patent/US10312840B2/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1215944A (en) * | 1997-09-26 | 1999-05-05 | 三洋电机株式会社 | DC brushless motor drive device |
| CN102739139A (en) * | 2011-04-01 | 2012-10-17 | 思科普有限责任公司 | Rear electromagnetic force detection circuit |
| EP2570291A1 (en) * | 2011-09-16 | 2013-03-20 | Siemens Aktiengesellschaft | Drive system of a battery-operated vehicle with a frequency converter fed permanently excited synchronous machine |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3105848A1 (en) | 2016-12-21 |
| US10312840B2 (en) | 2019-06-04 |
| EP3105848B1 (en) | 2019-07-10 |
| WO2015121467A1 (en) | 2015-08-20 |
| CN105981290A (en) | 2016-09-28 |
| JP6726101B2 (en) | 2020-07-22 |
| US20170070169A1 (en) | 2017-03-09 |
| DE102014202771A1 (en) | 2015-08-20 |
| DK3105848T3 (en) | 2019-10-21 |
| ES2750316T3 (en) | 2020-03-25 |
| JP2017506535A (en) | 2017-03-09 |
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